Door lock bolt



Aug- 31, 1948- y o. J. BUNTEN 2,448,415

DOOR LOCK BOLT Filed Jan. 9. 1947 Patented Aug. 31, 1948 UNITED STATES 'I 2,448,415;

' DGORILOCKLBOULY" Oliver J. Buiten, Cambridge-,- Mass.

Application Januaryil, 194V;V Serial'lNo: 721,05'9

present invention: relates toV verticall `type locking bolts:` for; doors, and'v particularly: to:` a

doonbolt havingmeans "for preventing' unauthorv comprises azlocking boltat both, top. and bottom.

of'. thel door and an' operating: handle l'la'lfy'vayA between: the -top and bottom.; together: with. con,-

n'ecting. meansl extending.l between` the. locking;

boltsiand-.operating- .handle :whereby both locking.;V bolts.Y may` be.V movedz simultaneouslyy to either, locked-.or unlocked position when` the. handle is rotated.`

In'. connection with such-1locks, ;as applied to.

storedoors y and the like; considerable annoyance,`

and. inconvenience has'been. occasioned by small boys. tampering;` with them.

when the door is. opened,rthe vbolt mechanismis in.. plain view-.any person; so inclined, may-swing the..door on doors shut; and operatefthe.handle4 This makes passage;l through. such door impossible 'untilsomeone. fromvv so.` as. to, lock:l the; door..

the inside 4unlocks.` and opens theidoor.

The mischievous individual is. generallyf a small;

boy r.girl-and-.` accordingly in designing a means to overcome this inconvenience while utilizing the conventional lockinggstructure.; I` have associated with such locking struciaurezas.v an integralpart thereof' a tamper-preventing mechanism. which is separated from the operating handle for the door lockingfbolts-:a distance greater'than the Inasmuch asgthe; doors.- arey usuallylocked from the inside; and:y

aclaimsz; (01. 29e-issie normal reach or span of, the-...small individual'` when grasping saidi handle.. and. simultaneously attemptingto reach and?l` operate the tamper-- preventing mechanism. Preferably, my tamperpreventingmechanism is associated with the lower locking bolt of the conventional door-locking structure.

The object of my present invention therefore, is an improved means for preventing unauthorized tampering with a, door locking means.

Another object is an improved means for positively holding a locking bolt in unlocked position.

Still another object is an improved locking means having locking bolts located at the top and bottom of a door and with handle means connected thereto for moving said bolts into and out of locking position, and with means associated with one of said bolts for holding said bolt in unlocked .positionf and :for preventingftlierrmweeL-fu ments-of `said bolty into* lockinglv position exceptf upon operationofJ-the said' meansasimultaneouslys with. the operation ofl the handle.V

Other objects and novelffeatures' of the cone struction; andoperation' of` the`- device -wiilbappearf asthe description of' the` inventiom progresses-:2

In the accompanying drawing.: illustrating-3 a;V preferred'.embodimentroivmyvinventiont;

Figure 1" is. a'. fragmentaryffront". elevation-s offlla.; doorandv at. conventional verticals type locking. bolt'.` equippediwith myftamperepreventingvmecheanismz.

Figure 12 isla-1sectionalplanfview' takerrson' ther line 2.-'2'of Fig.. 1,1and?looking?,imthekdirection: of the arrows.

Figure ,.ista rearelevationf orthefbottomifmem'- berzof` the i locking-device lwith .partsrbrokenawayg andpfpartlyfin section;l and I showing the. -tannzierev preventing;` mechanism: inf position Q to'l hold? their locking bolt. in.' open.;l inoperative:V position". and;v

Figure 4v isi a. fragmentaryview 'ofi` a: portion: of Fig. 3, and showin'gathe'.` vtamperi-preventingf: mechanism in: locking.position'.-r

Referringvto the drawing; lt'designates: ay door;

ofnwhichf' I I 1 designates. theaupper:pentium` Ia2`f th'efs. middle portion, arniff I3'the lower*portion*` Ther` door: I Il .f1-nay' be: a: single doouor; moreausually; onetof azfpair oftdoorsitted, forfexamplfinfa-r relatively Wider: doorway#A designated?.` by:P their topl casing `mernberf I4l Vandi the: lower.4 casing-r meimA Y bert I5:

Fitted; into theflower facefof the topfmember'* III;y and securedptheretoibyscrews IBF; isftiie'zlockscrews: IlVis-.thev locking bolt socket yBoltI sockets. I1 and 'ISE are in alignmentA with" upper# and. lower-Y locking .boltsr 2 0 A"and`f2l respectively;

Upper "-lockingboltxa 2.01115 f slidablyr mounted ri a1. casing-x 2 2:2 secured'.c to .thea` upper f parti IiIf` offt'lier` door I' by screws 23, and lower locking bolt 2I is slidably mounted in a casing 24 secured by screws 23 to the lower part I3 of the door I0. Both locking bolts are connected by rods 25 and 26 respectively, to operating mechanism (not shown) contained in casing 21 secured to the middle portion I2 of the door by screws 28.

The operating mechanism (referred to but not shown) is conventional and is operated by the operating handle 29. As viewed in Fig. 1, operating handle 29 is shown in the door unlocking position, and locking bolts 2li and 2| are in their retracted position and therefore out of engagement with the locking bolt sockets I'I and I9.

tion by a screw 3| on a vertical web 32 projecting from casing 24. There is a. channel 33 formed in the body of the locking bolt 2| and in the sides of the material forming the channel 33 are milled oppositely disposed grooves 34. A portion of the material of the locking bolt 2| is sectioned, see

Fig. 3, to show one of such milled grooves 34.

36 are gradually moved outwardly by the expansion of the spring 39 until they assume the position shown in Fig. 4.

The tamper-preventing device is positive `in action, and mere inspection of the lower casing and parts carried thereby will not disclose to an immature person the presence or function of the locking members.

Furthermoramy device is of such to 'comply with existing fire laws.

While I have shown and described a preferred design as ,embodiment of my invention, it will be under- `Astood that various modications in its construc- Pivotally mounted at the top of and within the grooves 34, on pins 35 are locking members 36. As shown in Figs. 3 and 4, such locking members 36 each comprises a body having a cam surface 3-1 at its outer face inclining outwardly and downwardly, and with adepending projection or stop 38 on the inner lower edge of the body. Also, the medial inner edge of the body is recessed to receive the -ends of an extensionspring 39, which recesses hold such spring in operative position.

When the device is in the position shown in Figs. 2 and 3, the spring 39 will expand or open, swinging the locking members 3S outwardly on their pivots 35 until their outer lower ends extend beyond the limits dening the width of the groove 2-la, this outward swinging movement terminating when the projections or stops 38 engage with the sides of the channel 33.

The locking bolts 29 and 2| are now out of engagement With the locking sockets I'| and i9 re` spectively, `the handle 29 is in the position shown, and the tamper-preventing device illustrated in Figs. 2 and 3 will prevent operation of the device to 4again bring lthe bolts 20 and 2| into engagement with the locking-sockets and 9.

The distance between the operating handle 29 and the locking members 36 of the lower locking bolt 2| is too great to be spanned by a small boy or girl attempting to grasp both in the effort to lock the 'door I9. An adult however will have lno particular difficulty ,inv this regard. Such latter person will grasp the locking members 36 and swing the same inwardly in the grooves 34 until the lower outer ends thereof clear the same. Still holding the locking members 36 in compressed condition, the handle 29 will now be rotated counter-clockwise, as viewed in Fig. 1 and into vertical position. Such movement will force the bolt 2|, and the locking members 36 downwardly inthe channel or groove .2|a, bringing the locking bolt 2| into engagement with the locking socket i9. As the bolt 2| moves downwardly as viewed in Fig. 3, the locking members tion and design may be resorted to within the spirit and scope of the invention as dened by the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. Means for preventing unauthorized tampering with a door locking bolt of the vertical type,

comprising in combination with such locking bolt,

operating means carried by the door at a point remote from the locking bolt and connected to the bolt, and means carried by the bolt for preventing movement of the bolt to locking position except upon simultaneous operation of the means carried by the bolt and the operating means.y

2. In combination with a door casing secured to a door adjacent to the lower end thereof andhaving a vertically arranged groove, a locking bolt slidably mounted in said groove, said bolt having a, vertical passage and having aligned grooves formed in the side walls of the locking bolt adjacent to the top end of said vertical passage, locking means pivotally mounted on-said locking bolt and housed for swinging movement in said aligned grooves, a cam surface formed on the outer edge of the pivotally mounted locking means -engageable 'duringthe movement of the locking bolt from locking to unlocking position, a. stop formed on the inner lower end; of each of the locking means and engage'able with the locking bolt to prevent undue outward swinging movement of the pivoted locking means,and a spring positioned to move the locking means outwardly to bring the lower end thereof into engagement with the casing and with the stop engaging the locking bolt. v

` OLIVER J. BUNTEN.

REFERENCES CITED The following references are of record in the le of this patent:V

UNITED STATES PATENTS Gorrell Mar.f4, 1941 

